Could our Universe be a simulation? How would we even tell?
Briefly

"But I have to warn you: If you're hoping for relief, one way or the other, from the existential crisis brought about by the possibility that we live in a simulation, you won't find any comfort here. The firmest conclusion anyone can reach, after examining and re-examining the arguments for and against the simulation thesis, is a profound yet resigned 'maybe.'"
Bostrom's argument relies on a simple observation. We continue to develop ever more powerful and capable computers, and our abilities to simulate the Universe, from cosmic to microscopic scales, are becoming more comprehensive with time.
Read at Ars Technica
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